One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,3)(5,6)(7,10)(8,12)(9,11)(13,14,17,22)(15,24,27,19)(16,23,25,21)(18,28,20,26)(5,7,9,8)(6,10,11,12)(13,15,25,28,17,27,16,26)(14,18,23,19,22,20,21,24)(1,3,4,2)(5,8,9,7)(6,10,11,12)(13,15,17,27)(14,19,22,24)(16,26,25,28)(18,23,20,21)(6,11)(10,12)(13,15,17,27)(14,20,22,18)(16,28,25,26)(19,21,24,23)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.